メモ: Tumblr が L キーでどのように Like を実行しているかのコード部

gistfile1.js

function _submit_like_toggler(post_id) {
    var unlike = $('like_button_' + post_id).hasClassName('already_like') ? true : false;
    var like_form_action = $('like_form_' + post_id).action;
    var root_id = $('like_button_' + post_id).hasAttribute('data-root-post-id') ? $('like_button_' + post_id).getAttribute('data-root-post-id') : false;
    if (unlike) {
        $('like_button_' + post_id).removeClassName('already_like');
        $('like_form_' + post_id).action = like_form_action.replace('/unlike', '/like');
        decrement_note_count(post_id);
        if (root_id) {
            $$('.like_root_' + root_id).invoke('removeClassName', 'already_like')
        }
    } else {
        $('like_button_' + post_id).addClassName('already_like');
        $('like_form_' + post_id).action = like_form_action.replace('/like', '/unlike');
        increment_note_count(post_id);
        if (root_id) {
            $$('.like_root_' + root_id).invoke('addClassName', 'already_like')
        }
    }
}
function submit_like(post_id, custom_z	r) {
    var like_form_action = $('like_form_' + post_id).action;
    if (typeof custom_toggler == 'undefined') {
        _submit_like_toggler(post_id)
    } else {
        custom_toggler()
    }
    new Ajax.Request(like_form_action, {
        asynchronous: true,
        parameters: Form.serialize($('like_form_' + post_id)),
        onFailure: function () {
            new Ajax.Request(like_form_action, {
                asynchronous: true,
                parameters: Form.serialize($('like_form_' + post_id)),
                onFailure: function () {
                    alert(l10n_str.ajax_error);
                    if (typeof custom_toggler == 'undefined') {
                        _submit_like_toggler(post_id)
                    } else {
                        custom_toggler()
                    }
                }
            })
        }
    })
}
/* ... */
function start_observing_key_commands(auto_paginate) {
    Event.observe(document, 'keydown', function (e) {
        if (!key_commands_are_suspended) {
            var code = e.charCode ? e.charCode : e.keyCode;
            if (!e.shiftKey && !e.ctrlKey && !e.altKey && !e.metaKey) {
                if (code == Event.KEY_LEFT) {
                    if (!auto_paginate && !$('tumblr_lightbox')) {
                        if ($('previous_page_link')) location.href = $('previous_page_link').href
                    }
                } else if (code == Event.KEY_RIGHT) {
                    if (!auto_paginate && !$('tumblr_lightbox')) {
                        if ($('next_page_link')) location.href = $('next_page_link').href
                    }
                } else if (code == 74 || code == 75 || code == 76) {
                    var post_positions = new Hash();
                    $('posts').childElements().each(function (post) {
                        if (post.hasClassName('post') && post.id && post.id.indexOf('post_') === 0) {
                            post_positions.set(post.id, post.offsetTop)
                        }
                    });
                    var go_to_position = 0;
                    post_positions.each(function (pair) {
                        var post_id = pair.key;
                        var post_position = pair.value;
                        var current_position = document.viewport.getScrollOffsets().top + 7;
                        if (code == 74) {
                            if (post_position > current_position && (post_position < go_to_position || !go_to_position)) {
                                go_to_position = post_position
                            }
                        } else if (code == 75) {
                            if (post_position < current_position && post_position > go_to_position) {
                                go_to_position = post_position
                            }
                        } else if (code == 76) {
                            if (post_position == current_position && $('like_form_' + post_id.replace('post_', ''))) {
                                submit_like(post_id.replace('post_', ''))
                            }
                        }
                    });
                    if (go_to_position) window.scrollTo(0, go_to_position - 7)
                }
            }
        }
    })
}